DE3709025A1 - Contact apparatus for the electronically controlled synthesis of coloured and white light for different illuminating purposes - Google Patents

Abstract

The apparatus makes possible a play of colours with the colours of the visible (light, optical) spectrum and with "white". Changing from one colour to another colour can be performed continuously by means of an electronic control, in any sequence, at any speed, and with freely selectable intensity. As a result of its compact, light, and low-reaction construction, this apparatus can be used as basic element for different illuminating bodies. With the aid of the primary colours RED, GREEN, and BLUE, three light sources which can be dimmed independently of each other produce this function in a light source arrangement in accordance with subclaim 2 or 3. The lights of the light sources (2, 12, 18) is focused by the reflectors (1, 6, 19) and guided through the heat-absorbing filters (3, 7, 17). The design according to subclaim 3 has a light source arrangement having a total of only five colour filter items (see also Fig. 1). The colour filters 16 (RED, see also Fig. 2), 8 (GREEN, see also Fig. 3) and 4 (BLUE, see also Fig. 4) assign the light sources their primary colours (15 = RED, 13 = GREEN, 5 = BLUE). Two colour-splitting mirros 9 (reflecting RED, see also Fig. 5) and 10 (reflecting BLUE, see also Fig. 6) are perpendicular with respect to each other, the three partial beams meet there in each case at an angle of 45@. The design according to subclaim 2 has a light source arrangement having a total of only two colour-splitting mirror items. In this case, the colour filters 16, 8 and 4 can be saved (compare Fig. 1). The effectiveness of ... Original abstract incomplete. <IMAGE>

Description

Genre of the object of registration

The invention relates to a compact device for the electro nically controlled synthesis of colored and white light the preamble for claim 1.

Information on the genus

The device enables a play of colors with the colors of the Light spectrum and with "white". The change from one color to Another color can be controlled electronically continuously in any order, with any ge speed, and with a freely selectable intensity.

This device can due to its compact design and its low-impact function as a basic building block for ver different lighting fixtures are used.

Basically stand for different applications two alternatives are available.

The design according to subclaim 2, with only two color filters, offers a high luminous efficacy.

The design according to subclaim 3 contains a total of 5 pieces Color filter, and is also capable of using colored light to produce greater color saturation.

State of the art

The different colored coloring of light by is known the old color changing wheel. There turn on motor driven color filters in front of a light source.

Criticism of the state of the art

The color changing wheel takes up a relatively large space Claim, because the color filter wheel has more than twice as large a diameter as the light source.

The colors can only be in stages one after the other, in a fixed order and without mixed products consequences.

task

The invention has for its object a retroactive effect poor, compact and therefore versatile device for the electronically controlled synthesis of colored and white To produce light.

solution

This object is achieved in that an electronically controlled brightness distribution over the three basic colors RED, GREEN and BLUE a synthesis of colored light and by "white" is achieved.

In the design according to subclaim 3 (see also Fig. 1), three light sources are changed in their brightness independently with the aid of three dimmers.

An electronic control acts on the three dimmers. The setting of the dimmers affects the brightness of the three light sources ( 2, 12, 18 ). The infrared filters ( 3, 7, 17 ) are connected downstream of the light sources in order to reduce the thermal load on the subsequent assemblies. The color filters ( 4, 8, 16 ) assign the light sources their basic color.

The light from the light source ( 18 ) is bundled by the reflector ( 19 ) and predominantly strikes the color filter ( 16 ) perpendicularly, which predominantly transmits red light ( 15 ). The characteristic curve of a usable filter ( 16 ) is shown in Fig. 2.

The light from the light source ( 12 ) is bundled by the reflector ( 6 ) and predominantly strikes the color filter ( 8 ) perpendicularly. The color filter ( 8 ) predominantly transmits green light ( 13 ). The characteristic curve of a filter ( 8 ) that can be used is shown in Fig. 3.

The light from the light source ( 2 ) is focused by the reflector ( 1 ) and predominantly strikes the color filter ( 4 ) perpendicularly. This color filter ( 4 ) predominantly transmits blue light ( 5 ). The characteristic curve of a filter ( 4 ) that can be used is shown in Fig. 4.

The green partial beam ( 13 ) hits the color splitter mirror ( 9 ) at 45 degrees. The characteristic curve of a divider that can be used ( 9 ) is shown in Fig. 5. It is a color divider that reflects the red components of the light and transmits the remaining components. This divider thus lets this green light beam through in the direction of the optical axis.

The red partial beam ( 15 ) strikes the same color splitter mirror ( 9 ) at 45 degrees and is reflected there in the direction of the optical axis. Both partial beams ( 13 and 15 ) are transmitted by the subsequent color splitter mirror ( 10 ).

The blue partial beam ( 5 ) strikes the color splitter mirror ( 10 ) at 45 degrees and is reflected by it in the direction of the optical axis. So this filter ( 10 ) is a filter that mainly reflects the blue portion of the light and transmits the remaining components. The characteristic of a usable divider ( 10 ) is shown in Fig. 6.

All three partial beams meet in the optical axis of the device and form the total light beam ( 14 ). This light beam is coupled out via projection optics ( 11 ).

Because the light source ( 2 ) emits only a relatively small proportion of blue light and the color filter ( 10 ) reflects blue light better than it lets it through, this combination was chosen. The brightness of the already weak blue light is better used. The color perception of the human eye is particularly pronounced in the green parts of visible light. Attenuation of the light intensity within the device can therefore be accepted more easily with green light. Therefore the green beam ( 13 ) was passed through both splitter mirrors.

The paths that the light travels from the light sources ( 2, 12, 18 ) to the projection optics ( 11 ) should be the same. This ensures uniform light distribution and better coverage of the partial beams.

The heat sources are due to the symmetrical structure distributed in the housing. The power loss that arises dissipated by forced ventilation.

There are three sensors inside the device (not shown). This is optoelectronic Red, green and blue sensors. With help This sensor technology enables the actual values of the brightness with the setpoints to compare the manipulated variable for the Determine dimmer (control loop). Nonlinearities, Toleran zen, as well as aging in the system are compensated. This technology still makes it possible to create a complete Carry out self-test of the device.  

In the design according to subclaim 2, the color filters ( 4, 8, 16 , see also Fig. 1) are omitted. The entire structure is easier. The effectiveness of the color splitter mirrors ( 9, 10 ) determines the achievable color saturation of the light beam ( 14 ) in the basic colors RED, GREEN and BLUE.

The absence of the bandpass filter ( 4, 8, 16 ) and the quality of the divider mirrors ( 9, 10 ) that can be achieved today increases the brightness of the overall system with reduced color saturation.

Further embodiment of the invention

The use of compact high-performance halogen spotlights makes the solution easier. The use of a fan (not shown) extends the life of the device.

By using dichroic color filters temperature-resistant glass becomes a great color consistency and one longer life compared to e.g. B. filter films Plastic reached.

Achievable advantages

The advantages achieved with the invention are above all in that all through an electronic control Colors of visible light and "white" are generated can. These colors can be continuous, in any Order, and with each other at any speed pass over. The brightness is freely selectable.

The symmetrical arrangement of the light sources in the housing ver avoids heat build-up and allows the mech to be nested anic components. This makes the compact structure and promoted a symmetrical position of the center of gravity.

The usability is also improved in that the Low heat development due to heat filter and fan is held.

A possible splintering of the light source is caused by the after switched filter kept away from the viewer (splitter protection).

Claims (6)

1. Compact device for electronically controlled synthesis of colored and white light for various lighting purposes. Characteristic part The device is characterized in that different spectral colors of the visible light and white light can be generated in succession by a compact light source arrangement with the aid of an electronic control. Preamble of the subclaim, characterizing part of the subclaim 2. Apparatus according to claim 1, characterized in that three independently dimmable light sources in one light source arrangement with only two pieces of color filters Create function. The color filters are perpendicular to each other other, the partial beams of the three light sources hit each at an angle of 45 degrees. 3. Device according to claim 1, characterized in that three independently dimmable light sources in one light source arrangement with only five pieces of color filters also light can radiate colors with greater color saturation. Three Color filters are used to improve color saturation and are illuminated vertically by the three partial beams. Two pieces of color filters are perpendicular to each other, the part rays of the three light sources hit each other there at an angle of 45 degrees. 4. Exclusive effect, possible from the use of 3 pieces Devices according to claim 1, characterized in that the illuminated object in all colors of the visible Light and can appear in "white" while the Partial beams of the three devices that are on the object meet, another color can stand. 5. Exclusive effect, possible from the use of 3 pieces Apparatus according to claim 1, the light rays of which on the illuminating object, characterized in that the illuminated object with changing output colors of the three Devices continue to appear in the same color.